View the structure of the table and Alter table
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1 the command to view the structure of the table.
The structure of a table can be viewed using the DESCRIBE TABLE_NAME command. This command shows the entire schema of the table.
2 the limitation of alter command
ALTER Command supports only the RENAME TABLE and ADD COLUMN variants. Other kinds of ALTER TABLE operations such as DROP COLUMN, ALTER COLUMN, ADD CONSTRAINT are omitted
Alter Table command is a DDL command that is used to change the definition of the table. Changing definition means changing datatype, width of columns or adding a new column in the table.
Column can’t be deleted with alter command.
Column can’t be renamed a column.
Column can’t be added in between of the existing columns.
When a column is added, it will be added at the end of the table.
- View the structure of the table and Alter table
- 79.View the Exhibit and examine the structure of the CUSTOMERS table. In the CUSTOMERS table, the CU
- 93.View the Exhibit and examine the structure of the CUSTOMERS table. Using the CUSTOMERS table, y o
- 8.View the Exhibit and examine the structure of the CUSTOMERS table.
- 11.View the Exhibit and examine the structure of the PRODUCTS table.
- 13.View the Exhibit and examine the structure of the PRODUCTS table.
- 44.View the Exhibit and examine the structure of the ORD table.
- 52.View the Exhibit and examine the structure of the PRODUCTS table.
- 54.View the Exhibit and examine the structure of the CUSTOMERS table.
- 56.View the Exhibit and examine the structure of the PROMOTIONS table.
- 61.View the Exhibit and examine the structure of the PROMOTIONS table.
- 62.View the E xhibit and examine the structure of the CUSTOMERS table.
- 63.View the Exhibit and examine the structure of the PRODUCTS table.
- 65.View the Exhibit and examine the structure of the CUSTOMERS table.
- 84.View the Exhibit and examine the structure of the EMPLOYEES table.
- 99.View the Exhibit and examine the structure of the PROMOTIONS table.
- 100.View the Exhibit and examine the structure of the PROMOTIONS table.
- 110.View the Exhibit and examine the structure of the CUSTOMERS table.
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